Make sure that you have the latest version of Data Bridge installed (currently, 1.1.9 is the latest version).
Version 1.1.9 has an auto recover feature that will remember the settings when a crash occurs.
Usually, the crash is a result of a dreamweaver memory leak. if you have had Dreamweaver running for a while, you may want to restart the OS to force Dreamweaver to put memory it has been using back.
When you run the Data Assist Wizard, Are you using one of the application presets? or using the New From Blank preset?
Are you using your own table? or having the wizard create the table for you?
If you are using your own table can you provide a dump of the database structure so i can try to recreate the problem?